So, I moved my nextcloud directory from a local SATA drive to a NFS mount from a nvme array on a 10G network

“I just need to change /docker/nextcloud to /mnt/nfs/nextcloud in the docker-compose.yml, what’s the issue, i do it live” - i tell myself

So i stop the container, copy /docker/nextcloud to /mnt/nfs/nextcloud, then edit the docker-compose.yml… and… because I’m doing it during a phone call without paying too much attention i change the main directory to /docker

I rebuild the container and I immediately hear a flood of telegram notifications from my uptime-kuma bot… oh oh…

Looks like the nextcloud docker image has an initialization script that if it doesn’t find the files in the directory, it will delete everything and install a fresh copy of nextcloud… so it deleted everything on my server

Luckily i had a very recent full borg backup and i’m restoring it (i kinda love-hate borg, i always forget the restore commands when in panic and the docs are a bit cryptic for me)

Lessons learned:

  1. always double check everything

  2. offsite backups are a must (if i accidentally wrote / as path, i would have lost also the borg backups!)

  3. offsite backups should not be permanently mounted, otherwise they would have been wiped as well

  4. learn how to use and schedule filesystem snapshots, so the recovery wouldn’t take ages like it’s taking right now (2+ hours and i’m not even half way…)

  • BakkodaEnglish
    41·
    1 year ago

    Never use /dev/sdX device paths, use UUIDs. They exist for a reason.

    This is absolutely fantastic advice.

    • yiliu@informis.landEnglish
      15·
      1 year ago

      You can label your devices. When formatting, do mkfs.ext4 -l my-descriptive-name /dev/whatever. Now, refer to it exclusively by /dev/disk/by-label/my-descriptive-name. Much harder to mix up home and swap than sdc2 and sdc3 (or, for that matter, two UUIDs).